/* ============================================================
   星慕网络科技有限公司 · 企业官网
   设计风格：半拟物（Soft Neumorphism）· 简约大气
   ============================================================ */

:root {
  /* 基础色板 —— 浅色半拟物背景 */
  --bg: #e9edf3;
  --bg-soft: #eef2f8;
  --surface: #eef1f7;
  --surface-raised: #f4f7fc;

  /* 拟物高光 / 暗影 */
  --shadow-light: #ffffff;
  --shadow-dark: #c5cad6;
  --shadow-dark-strong: #b3b9c8;

  /* 文字 */
  --text: #2a3142;
  --text-soft: #5a6276;
  --text-mute: #8b93a7;

  /* 品牌主色（科技蓝紫渐变） */
  --brand-1: #6366f1;
  --brand-2: #3b82f6;
  --brand-3: #22d3ee;
  --brand-grad: linear-gradient(135deg, #6366f1 0%, #3b82f6 55%, #22d3ee 100%);
  --brand-grad-soft: linear-gradient(135deg, #818cf8 0%, #60a5fa 55%, #67e8f9 100%);

  /* 圆角 */
  --r-sm: 14px;
  --r-md: 22px;
  --r-lg: 32px;
  --r-pill: 999px;

  /* 过渡 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 0.25s;
  --t-mid: 0.45s;
  --t-slow: 0.8s;

  /* 容器宽度 */
  --maxw: 1180px;
}

/* ---------- Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 12% -10%, rgba(99, 102, 241, 0.10), transparent 60%),
    radial-gradient(1000px 500px at 100% 0%, rgba(34, 211, 238, 0.10), transparent 55%),
    radial-gradient(900px 700px at 50% 120%, rgba(59, 130, 246, 0.08), transparent 60%);
  background-attachment: fixed;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ---------- 半拟物核心工具类 ---------- */
.neu {
  background: var(--surface);
  border-radius: var(--r-md);
  box-shadow: 9px 9px 20px var(--shadow-dark), -9px -9px 20px var(--shadow-light);
}
.neu-sm {
  background: var(--surface);
  border-radius: var(--r-sm);
  box-shadow: 5px 5px 12px var(--shadow-dark), -5px -5px 12px var(--shadow-light);
}
.neu-inset {
  background: var(--bg-soft);
  border-radius: var(--r-md);
  box-shadow: inset 6px 6px 12px var(--shadow-dark), inset -6px -6px 12px var(--shadow-light);
}

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: 96px 0; position: relative; }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 3px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--brand-1);
  padding: 8px 18px;
  border-radius: var(--r-pill);
  background: var(--surface);
  box-shadow: inset 3px 3px 7px var(--shadow-dark), inset -3px -3px 7px var(--shadow-light);
  margin-bottom: 18px;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: 1px;
  line-height: 1.25;
  margin-bottom: 16px;
}
.section-sub {
  color: var(--text-soft);
  font-size: 16px;
  max-width: 620px;
  margin-bottom: 48px;
}
.text-grad {
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: all var(--t-mid) var(--ease);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.nav-shell {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 14px 10px 22px;
  border-radius: var(--r-pill);
  background: rgba(238, 241, 247, 0.72);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 6px 6px 16px var(--shadow-dark), -6px -6px 16px var(--shadow-light);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.5px;
  white-space: nowrap;
}
.brand .logo {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: var(--brand-grad);
  display: grid; place-items: center;
  color: #fff; font-weight: 900; font-size: 18px;
  box-shadow: 3px 3px 8px rgba(99,102,241,0.45), inset 2px 2px 4px rgba(255,255,255,0.35);
}
.brand small { display: block; font-size: 11px; font-weight: 600; color: var(--text-mute); letter-spacing: 2px; }

.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  position: relative;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-soft);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.nav-links a:hover { color: var(--brand-1); }
.nav-links a.active {
  color: var(--brand-1);
  background: var(--surface);
  box-shadow: inset 3px 3px 7px var(--shadow-dark), inset -3px -3px 7px var(--shadow-light);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 26px;
  border: none;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
  white-space: nowrap;
}
.btn-primary {
  color: #fff;
  background: var(--brand-grad);
  box-shadow: 5px 5px 14px rgba(59,130,246,0.45), -4px -4px 12px var(--shadow-light), inset 1px 1px 2px rgba(255,255,255,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 7px 7px 18px rgba(59,130,246,0.5), -5px -5px 14px var(--shadow-light), inset 1px 1px 2px rgba(255,255,255,0.4); }
.btn-primary:active { transform: translateY(0); box-shadow: inset 4px 4px 10px rgba(49,46,129,0.5), inset -4px -4px 10px rgba(255,255,255,0.25); }

.btn-ghost {
  color: var(--brand-1);
  background: var(--surface);
  box-shadow: 5px 5px 12px var(--shadow-dark), -5px -5px 12px var(--shadow-light);
}
.btn-ghost:hover { transform: translateY(-2px); color: var(--brand-2); }
.btn-ghost:active { transform: translateY(0); box-shadow: inset 4px 4px 9px var(--shadow-dark), inset -4px -4px 9px var(--shadow-light); }

.btn-lg { padding: 16px 34px; font-size: 16px; }

.nav-toggle { display: none; }

/* ============================================================
   首页 Hero
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 120px;
  padding-bottom: 60px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(36px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: 0.5px;
  margin-bottom: 22px;
}
.hero p.lead {
  font-size: 18px;
  color: var(--text-soft);
  max-width: 520px;
  margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-stats { display: flex; gap: 30px; flex-wrap: wrap; }
.hero-stats .stat .num {
  font-size: 34px; font-weight: 900;
  background: var(--brand-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-stats .stat .label { font-size: 14px; color: var(--text-mute); font-weight: 600; }

/* Hero 装饰面板（半拟物卡片堆叠） */
.hero-visual { position: relative; height: 460px; }
.glass-card {
  position: absolute;
  border-radius: var(--r-lg);
  padding: 26px;
  background: var(--surface);
  box-shadow: 12px 12px 28px var(--shadow-dark), -12px -12px 28px var(--shadow-light);
}
.glass-card .chip {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 700; color: var(--brand-1);
  padding: 7px 14px; border-radius: var(--r-pill);
  background: var(--bg-soft);
  box-shadow: inset 3px 3px 7px var(--shadow-dark), inset -3px -3px 7px var(--shadow-light);
  margin-bottom: 14px;
}
.glass-card h4 { font-size: 18px; margin-bottom: 6px; }
.glass-card p { font-size: 13px; color: var(--text-mute); }

.card-a { top: 0; left: 0; width: 300px; }
.card-b { top: 130px; right: 0; width: 280px; }
.card-c { bottom: 0; left: 40px; width: 320px; }

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: 0.9;
}
.orb-1 { width: 150px; height: 150px; background: radial-gradient(circle at 30% 30%, #818cf8, #6366f1); top: 40px; right: 60px; box-shadow: 8px 8px 22px rgba(99,102,241,0.5); }
.orb-2 { width: 90px; height: 90px; background: radial-gradient(circle at 30% 30%, #67e8f9, #22d3ee); bottom: 70px; right: 200px; box-shadow: 6px 6px 16px rgba(34,211,238,0.5); }

/* ============================================================
   通用网格
   ============================================================ */
.grid { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  padding: 34px 30px;
  border-radius: var(--r-md);
  background: var(--surface);
  box-shadow: 9px 9px 20px var(--shadow-dark), -9px -9px 20px var(--shadow-light);
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: 14px 14px 30px var(--shadow-dark), -14px -14px 30px var(--shadow-light);
}
.card .icon {
  width: 60px; height: 60px;
  border-radius: 18px;
  display: grid; place-items: center;
  background: var(--brand-grad);
  color: #fff;
  font-size: 26px;
  margin-bottom: 20px;
  box-shadow: 4px 4px 12px rgba(59,130,246,0.4), inset 2px 2px 4px rgba(255,255,255,0.35);
}
.card h3 { font-size: 20px; font-weight: 800; margin-bottom: 10px; }
.card p { color: var(--text-soft); font-size: 15px; }

/* 价值 / 优势图标列表 */
.feature-row { display: flex; gap: 16px; align-items: flex-start; }
.feature-row .icon { width: 52px; height: 52px; flex: none; }

/* ============================================================
   关于我们
   ============================================================ */
.about-split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-visual {
  aspect-ratio: 1 / 1;
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: 12px 12px 28px var(--shadow-dark), -12px -12px 28px var(--shadow-light);
  display: grid; place-items: center;
  position: relative;
  overflow: hidden;
}
.about-visual .badge {
  width: 190px; height: 190px;
  border-radius: 50%;
  background: var(--brand-grad);
  display: grid; place-items: center;
  color: #fff; text-align: center;
  font-weight: 800; font-size: 22px; line-height: 1.3;
  box-shadow: 8px 8px 22px rgba(99,102,241,0.5), inset 3px 3px 8px rgba(255,255,255,0.4);
}
.about-visual .ring {
  position: absolute; inset: 26px;
  border-radius: 50%;
  border: 2px dashed rgba(99,102,241,0.4);
  animation: spin 22s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.timeline { position: relative; padding-left: 8px; }
.timeline::before {
  content: ""; position: absolute; left: 22px; top: 8px; bottom: 8px;
  width: 3px; border-radius: 3px;
  background: var(--brand-grad);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.4);
}
.tl-item { position: relative; padding: 0 0 34px 64px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item .dot {
  position: absolute; left: 12px; top: 4px;
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--surface);
  box-shadow: 3px 3px 8px var(--shadow-dark), -3px -3px 8px var(--shadow-light), inset 2px 2px 4px var(--shadow-dark);
  display: grid; place-items: center;
}
.tl-item .dot::after { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--brand-grad); }
.tl-item .year { font-weight: 800; color: var(--brand-1); font-size: 15px; }
.tl-item h4 { font-size: 17px; margin: 4px 0 6px; }
.tl-item p { color: var(--text-soft); font-size: 14px; }

.value-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.value-item { padding: 26px; border-radius: var(--r-md); background: var(--surface);
  box-shadow: 7px 7px 16px var(--shadow-dark), -7px -7px 16px var(--shadow-light); }
.value-item .vi-icon { font-size: 26px; margin-bottom: 12px; }
.value-item h4 { font-size: 17px; margin-bottom: 6px; }
.value-item p { font-size: 14px; color: var(--text-soft); }

/* ============================================================
   产品服务
   ============================================================ */
.service-card {
  padding: 36px 32px;
  border-radius: var(--r-md);
  background: var(--surface);
  box-shadow: 9px 9px 20px var(--shadow-dark), -9px -9px 20px var(--shadow-light);
  display: flex; flex-direction: column;
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}
.service-card:hover { transform: translateY(-6px); box-shadow: 16px 16px 34px var(--shadow-dark), -16px -16px 34px var(--shadow-light); }
.service-card .icon {
  width: 70px; height: 70px; border-radius: 20px; margin-bottom: 22px;
  display: grid; place-items: center; font-size: 32px; color: #fff;
  background: var(--brand-grad);
  box-shadow: 5px 5px 14px rgba(59,130,246,0.4), inset 2px 2px 5px rgba(255,255,255,0.35);
}
.service-card h3 { font-size: 22px; font-weight: 800; margin-bottom: 12px; }
.service-card p { color: var(--text-soft); font-size: 15px; margin-bottom: 20px; }
.service-card ul.checks { margin-top: auto; display: grid; gap: 10px; }
.service-card ul.checks li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--text-soft); }
.service-card ul.checks li::before {
  content: "✓"; color: #fff; font-size: 12px; font-weight: 800;
  width: 20px; height: 20px; flex: none; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--brand-grad);
  box-shadow: 2px 2px 6px rgba(59,130,246,0.4);
}

.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
.process .step { text-align: center; padding: 30px 18px; border-radius: var(--r-md); background: var(--surface);
  box-shadow: 7px 7px 16px var(--shadow-dark), -7px -7px 16px var(--shadow-light); position: relative; }
.process .step .no {
  width: 48px; height: 48px; margin: 0 auto 16px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 900; font-size: 18px; color: var(--brand-1);
  background: var(--bg-soft); box-shadow: inset 3px 3px 7px var(--shadow-dark), inset -3px -3px 7px var(--shadow-light);
}
.process .step h4 { font-size: 16px; margin-bottom: 6px; }
.process .step p { font-size: 13px; color: var(--text-mute); }

/* ============================================================
   联系我们
   ============================================================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px; align-items: start; }
.contact-info .ci-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 22px 24px; margin-bottom: 20px; border-radius: var(--r-md);
  background: var(--surface);
  box-shadow: 7px 7px 16px var(--shadow-dark), -7px -7px 16px var(--shadow-light);
}
.contact-info .ci-item .icon {
  width: 50px; height: 50px; flex: none; border-radius: 15px;
  display: grid; place-items: center; font-size: 22px; color: #fff;
  background: var(--brand-grad);
  box-shadow: 4px 4px 10px rgba(59,130,246,0.4), inset 2px 2px 4px rgba(255,255,255,0.35);
}
.contact-info .ci-item h4 { font-size: 15px; color: var(--text-mute); font-weight: 700; margin-bottom: 2px; }
.contact-info .ci-item p { font-size: 16px; font-weight: 700; }

.form-card { padding: 38px 34px; border-radius: var(--r-lg); background: var(--surface);
  box-shadow: 12px 12px 28px var(--shadow-dark), -12px -12px 28px var(--shadow-light); }
.form-card h3 { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.form-card .hint { color: var(--text-mute); font-size: 14px; margin-bottom: 26px; }
.field { margin-bottom: 20px; }
.field label { display: block; font-size: 14px; font-weight: 600; color: var(--text-soft); margin-bottom: 8px; }
.field input, .field textarea, .field select {
  width: 100%; padding: 14px 18px; font-size: 15px; font-family: inherit;
  color: var(--text); border: none; outline: none;
  border-radius: var(--r-sm);
  background: var(--bg-soft);
  box-shadow: inset 4px 4px 9px var(--shadow-dark), inset -4px -4px 9px var(--shadow-light);
  transition: box-shadow var(--t-fast) var(--ease);
}
.field input:focus, .field textarea:focus, .field select:focus {
  box-shadow: inset 4px 4px 9px var(--shadow-dark), inset -4px -4px 9px var(--shadow-light), 0 0 0 2px rgba(99,102,241,0.35);
}
.field textarea { resize: vertical; min-height: 120px; }
.field .err { color: #ef4444; font-size: 13px; margin-top: 6px; display: none; }
.field.invalid .err { display: block; }
.field.invalid input, .field.invalid textarea, .field.invalid select {
  box-shadow: inset 4px 4px 9px var(--shadow-dark), inset -4px -4px 9px var(--shadow-light), 0 0 0 2px rgba(239,68,68,0.4);
}

.map-placeholder {
  margin-top: 36px; height: 220px; border-radius: var(--r-md);
  background: var(--bg-soft);
  box-shadow: inset 5px 5px 12px var(--shadow-dark), inset -5px -5px 12px var(--shadow-light);
  display: grid; place-items: center; color: var(--text-mute); font-size: 14px; gap: 8px; text-align: center;
  position: relative; overflow: hidden;
}
.map-placeholder .pin { font-size: 34px; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  padding: 64px 0 30px;
  margin-top: 40px;
}
.footer-inner {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px;
  padding: 48px 40px; border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: 10px 10px 24px var(--shadow-dark), -10px -10px 24px var(--shadow-light);
}
.footer-inner .brand { margin-bottom: 16px; }
.footer-col h4 { font-size: 15px; font-weight: 800; margin-bottom: 16px; }
.footer-col a { display: block; color: var(--text-soft); font-size: 14px; padding: 6px 0; transition: color var(--t-fast); }
.footer-col a:hover { color: var(--brand-1); }
.footer-about p { color: var(--text-soft); font-size: 14px; margin-bottom: 16px; }
.footer-bottom { text-align: center; color: var(--text-mute); font-size: 13px; padding-top: 28px; }

/* ============================================================
   页面切换 / 加载动画
   ============================================================ */
.page-fade {
  opacity: 0;
  transform: translateY(14px);
  animation: pageIn 0.7s var(--ease) forwards;
}
@keyframes pageIn { to { opacity: 1; transform: none; } }

/* 过渡遮罩 */
.transition-veil {
  position: fixed; inset: 0; z-index: 999;
  background: var(--brand-grad);
  opacity: 0; pointer-events: none;
  transform: scaleY(0); transform-origin: bottom;
  transition: transform 0.5s var(--ease), opacity 0.4s ease;
}
.transition-veil.show { opacity: 1; transform: scaleY(1); transform-origin: bottom; }

/* 滚动揭示 */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { height: 380px; max-width: 520px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .process { grid-template-columns: repeat(2, 1fr); }
  .about-split, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  section { padding: 72px 0; }
  .nav-links, .nav-cta { display: none; }
  .nav-toggle {
    display: grid; place-items: center;
    width: 46px; height: 46px; border: none; cursor: pointer;
    border-radius: var(--r-pill); color: var(--brand-1); font-size: 22px;
    background: var(--surface);
    box-shadow: 4px 4px 10px var(--shadow-dark), -4px -4px 10px var(--shadow-light);
  }
  .nav-shell { padding: 8px 10px 8px 18px; }
  .mobile-menu {
    position: fixed; inset: 0 0 0 auto; width: min(78%, 320px);
    background: var(--surface); z-index: 200;
    padding: 90px 28px 28px;
    transform: translateX(110%); transition: transform var(--t-mid) var(--ease);
    box-shadow: -12px 0 30px var(--shadow-dark);
    display: flex; flex-direction: column; gap: 8px;
  }
  .mobile-menu.open { transform: none; }
  .mobile-menu a { padding: 14px 18px; border-radius: var(--r-sm); font-weight: 700; color: var(--text-soft); }
  .mobile-menu a.active { color: var(--brand-1); background: var(--bg-soft); box-shadow: inset 3px 3px 7px var(--shadow-dark), inset -3px -3px 7px var(--shadow-light); }
  .mobile-menu .btn { justify-content: center; margin-top: 14px; }
  .menu-backdrop { position: fixed; inset: 0; background: rgba(42,49,66,0.35); z-index: 150; opacity: 0; pointer-events: none; transition: opacity var(--t-fast); }
  .menu-backdrop.show { opacity: 1; pointer-events: auto; }

  .grid-2, .grid-3, .grid-4, .process, .value-list { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; padding: 36px 26px; }
  .hero-stats { gap: 22px; }
  .hero-visual { display: none; }
}

/* 管理员后台入口浮标 */
.admin-fab {
  position: fixed;
  right: 22px; bottom: 22px;
  width: 52px; height: 52px;
  display: grid; place-items: center;
  font-size: 22px; color: #fff;
  text-decoration: none;
  border-radius: 50%;
  background: var(--brand-grad);
  box-shadow: 5px 5px 14px rgba(59,130,246,0.45), -4px -4px 12px var(--shadow-light), inset 1px 1px 2px rgba(255,255,255,0.35);
  z-index: 90;
  transition: transform var(--t-fast) var(--ease);
}
.admin-fab:hover { transform: translateY(-3px) rotate(45deg); }

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}